| The paper is guided on the theory of reservoir description, and based on reservoir geology, development geology, reservoir physics and previous geological research results, making the analysis of basic characteristics and development results of Hu307-Xin46 region in Hujianshan Oilfield by means of comparative study on a variety of data. The research combines production practices with petroleum reservoir engineering demonstration and numerical simulation as the main technical means to study on the parameters of well pattern、 pressure、injection and production, determining the reasonable development parameters in the study area.The main results:1、Water flooding development effect① The control degree of water flooding in the whole research area is 91.2%, and the control degree of Hu307, An62 and Xin46 are 91.7%,91.2% and 91% respectively. The general level of control is well; the producing degree of flooding in the whole research area is 55.7%. Overall, the control degree for the entire research area is poor. Hu307 and Xin46 are 52.7% and 37.1%, respectively and both areas have a poor producing degree. The producing degree of An62 is 70.2%, and it is considered normal producing degree② The ultimate recovery ratio of the whole research area is 28.5%. The recovery ratio of Hu307, An62 and Xin46 are 28.7%,29.5% and 27% respectively.③ The rate of water storage of the entire research area is maintained at approximately 59%, and the water drive index has been gradually increasing. The water flooding effect is poor; The water storage rate of Hu307 and Xin46 are 56% and 38.8% respectively, and these water flooding effects are poor; An62 has maintained its rate of storage at a constant rate of 75. Its water drive index is stable and the water flooding effect is relatively good.④The current sweep efficiency in the study area is 15.29%,. The theoretical limit of the sweep efficiency is 83.80% and 16.20% are not affected. The current sweep efficiency in Hu307, An62 and Xin46 are 17.96%,17.84% and 18.78% respectively. The theoretical limit of the sweep efficiency are 84.97%,85.47% and 83.23% respectively. On a separate note, 15.03%,14.53% and 16.77% are not affected.2、Reasonable development parameters① Parameters of well pattern:The reasonable density of the well spacing in the study area is 9.14 wells per square kilometer, and the well spacing density in Hu307, An62 and Xin46 are 9.11 wells per square kilometer,7.94 wells per square kilometer and 9.11 wells per square kilometer respectively.② Parameters of pressure:The stratum pressure in the study area is 89.2%, and the minimum reasonable flow pressure is 2.88-5.26MPa, and the maximum reasonable production pressure drop is 4.8-7.18MPa. The standards of the reasonable pressure in Hu307, An62 and Xin46 are 85%,99.8% and 86%, and the minimum reasonable flow pressures are 2.57-5.86MPa,3.88-5.29MPa and 2.49-4.85MPa, and the maximum reasonable production pressure drop are 3.8-7.09MPa,5.49-6.9MPa and 4.89-7.25MPa.③ Parameters of injection:The reasonable injection-production ratio of the research area is 0.7-1.1 and the rational injection of single well in one day is 20-31.8 m3/d, and the largest infusion pressure of the down-flow well is 13.04-16.31MPa. The reasonable injection-production ratio in Hu307, An62 and Xin46 are 0.7-1.0,0.9-1.2 and 0.8-1.1 respectively, and the rational injection of single well in one day is 18.5-32.6 m3/d, 23-37.5m3/d and 13.3-23.4m3/d respectively. The maximal infusion pressure of the down-flow well is 12.82-16.02MPa,13.55-16.98MPa and 12.74-15.91MPa for Hu307, AN62 and Xin46 respectively.④ Parameters of production:The reasonable oil production rate in Hu307 is 2.08%, and the rates for An62 and Xin46 are 2.10% and 2.09% respectively. The reasonable oil production rate of the whole research area is 2.09%. The liquid production per unit thickness in Hu307, An62 and Xin46 are 0.75-1.15m3/(m·d),0.9-1.3m3/(m·d) and 0.7-1.25m3/(m·d) respectively, and for the whole area, it is 0.85-1.25m3/(m·d). The reasonable productivity in the study area is 3.69t/d, whereas in Hu307, An62 and Xin46, the production rates are 3.93t/d, 4.15t/d and 3.24t/d respectively. |
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